Instruction: Explain the purpose of these methods and when to use them for manual digest cycle triggering.
Context: Candidates must explain the AngularJS digest cycle and the specific use cases for manually triggering it using $apply() and $digest().
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Clarification and Assumption: The AngularJS digest cycle is a process that checks for changes in the model and view. When changes are detected, AngularJS synchronizes the model and view by updating them accordingly. This cycle is automatically triggered by most AngularJS events but there are scenarios where manual intervention is necessary.
$apply() method is used to manually initiate the digest cycle. It's particularly useful when changes to the model are made outside AngularJS's awareness, such as in the case of events triggered by third-party libraries, or DOM events that AngularJS does not wrap. The $apply() method takes a function as an argument, which it executes before triggering the digest cycle. This ensures that any model changes made within this function are propagated to the view....